Skip to content

Factory method java

Factory Method in Java

Abstract Product Interface

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
package edu.redwoods.factory.method;

public abstract class Computer {

    public abstract String getRAM();
    public abstract String getHDD();
    public abstract String getCPU();

    @Override
    public String toString(){
        return "RAM= "+this.getRAM()+", HDD="+this.getHDD()+", CPU="+this.getCPU();
    }
}

Concrete Products

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
package edu.redwoods.factory.method;

public class PC extends Computer {

    private String ram;
    private String hdd;
    private String cpu;

    public PC(String ram, String hdd, String cpu){
        this.ram=ram;
        this.hdd=hdd;
        this.cpu=cpu;
    }
    @Override
    public String getRAM() {
        return this.ram;
    }

    @Override
    public String getHDD() {
        return this.hdd;
    }

    @Override
    public String getCPU() {
        return this.cpu;
    }

}

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
package edu.redwoods.factory.method;

public class Server extends Computer {

    private String ram;
    private String hdd;
    private String cpu;

    public Server(String ram, String hdd, String cpu){
        this.ram=ram;
        this.hdd=hdd;
        this.cpu=cpu;
    }
    @Override
    public String getRAM() {
        return this.ram;
    }

    @Override
    public String getHDD() {
        return this.hdd;
    }

    @Override
    public String getCPU() {
        return this.cpu;
    }

}

Concrete Creator

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
package edu.redwoods.factory.method;

import edu.redwoods.factory.method.model.Computer;
import edu.redwoods.factory.method.model.PC;
import edu.redwoods.factory.method.model.Server;

public class ComputerFactory {

    public static Computer getComputer(String type, String ram, String hdd, String cpu){
        if("PC".equalsIgnoreCase(type)) return new PC(ram, hdd, cpu);
        else if("Server".equalsIgnoreCase(type)) return new Server(ram, hdd, cpu);

        return null;
    }
}

Simple Client for Factory Method Above

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
import edu.redwoods.factory.method.ComputerFactory;
import edu.redwoods.factory.method.model.Computer;

public class TestFactory {

    public static void main(String[] args) {
        Computer pc = ComputerFactory.getComputer("pc","2 GB","500 GB","2.4 GHz");
        Computer server = ComputerFactory.getComputer("server","16 GB","1 TB","2.9 GHz");
        System.out.println("Factory PC Config::"+pc);
        System.out.println("Factory Server Config::"+server);
    }

}